Well, not everything is supported, nor do I expect that there will be a time soon where everything will be supported. I do know that they Azure SQL DB team is working fast and furious on getting Azure SQL DB as close to SQL Server as possible. In regards
to NotSupportedByAzureSQLDbV12.config, yes, there is probably a few rules in there that are no longer true that I have not removed. I will note your examples above and do some testing and see verify that they are no longer an issue (like newsequentialid).

Thanks for the feedback and if you find any cases of false positives, please let me know.